Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands |
3 Months Ended | |
|---|---|---|
|
Jan. 01, 2019
USD ($)
|
Mar. 31, 2019
USD ($)
Facility
|
|
| Product Information [Line Items] | ||
| Warrants exercise or expiration period | Sep. 30, 2018 | |
| Cash and cash equivalents, maturity description | 90 days or less | |
| Number of leased facilities | Facility | 1 | |
| Lessee, operating lease, description | The Company also elected a policy of not recording leases on its condensed consolidated balance sheets when the leases have a term of 12 months or less and the Company is not reasonably certain to elect an option to purchase the leased asset | |
| ROU assets | $ 177 | |
| Lease liabilities | $ 2,410 | |
| ASU 2018-11 [Member] | ||
| Product Information [Line Items] | ||
| ROU assets | $ 200 | |
| Lease liabilities | 2,500 | |
| Derecognition of the deferred rent | $ 2,300 | |
| Maximum [Member] | ||
| Product Information [Line Items] | ||
| Short-term contractual maturities | 1 year | |
| Minimum [Member] | ||
| Product Information [Line Items] | ||
| Long-term contractual maturities | 1 year |