Commitments and Contingencies - Additional Information (Detail) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Contingencies And Commitments [Line Items] | |||
| Lease expense | $ 300,000 | $ 100,000 | $ 100,000 |
| Lease term | 89 months | ||
| CDC [Member] | |||
| Contingencies And Commitments [Line Items] | |||
| Royalties received | $ 20,000 | ||
| Granted royalty on sales of the next BEMA product | 1.00% | ||
| Net sales of next BEMA Product | $ 7,500,000 | ||
| Minimum [Member] | CDC [Member] | |||
| Contingencies And Commitments [Line Items] | |||
| Royalties received | $ 375,000 | ||