Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Basic and Diluted Net Income (Loss) per Share (Detail)

v2.4.1.9
Summary of Significant Accounting Policies - Schedule of Basic and Diluted Net Income (Loss) per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Basic:    
Net loss $ (31,917)us-gaap_NetIncomeLoss $ (10,073)us-gaap_NetIncomeLoss
Accretion to redemption value of redeemable convertible preferred stock   (9,289)us-gaap_PreferredStockAccretionOfRedemptionDiscount
Reduction in redeemable convertible preferred stock distribution entitlement upon extinguishment   313,933us-gaap_PreferredStockRedemptionDiscount
Amounts allocated to participating redeemable convertible preferred stock   (50,577)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Net (loss) income allocated to common stock-basic (31,917)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 243,994us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average number of common stock shares outstanding-basic 12,048,985us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 2,357,036us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net (loss) income per share-basic: $ (2.65)us-gaap_EarningsPerShareBasic $ 103.52us-gaap_EarningsPerShareBasic
Diluted:    
Net (loss) income allocated to common stock (31,917)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 243,994us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments from assumed conversion of redeemable convertible preferred stock   (254,067)us-gaap_DilutiveSecurities
Net loss allocated to common stock-diluted $ (31,917)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (10,073)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Total common stock equivalent shares 12,048,985us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 2,845,609us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net loss per share-diluted $ (2.65)us-gaap_EarningsPerShareDiluted $ (3.54)us-gaap_EarningsPerShareDiluted
Common Stock [Member]    
Diluted:    
Total common stock equivalent shares 12,048,985us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
2,357,036us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Preferred Stock [Member]    
Diluted:    
Total common stock equivalent shares   488,573us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember