Subsequent Events - Additional Information (Detail) $ in Thousands |
1 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Apr. 14, 2016 |
Jun. 02, 2015
USD ($)
|
Aug. 11, 2016
USD ($)
shares
|
Jun. 30, 2015
USD ($)
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
shares
|
|
| Subsequent Event [Line Items] | ||||||
| Proceeds from issuance of common stock | $ | $ 9,200 | $ 9,254 | $ 9,266 | $ 1,886 | ||
| Reverse stock split ratio | 0.1 | |||||
| Lincoln Park Capital Fund, LLC [Member] | ||||||
| Subsequent Event [Line Items] | ||||||
| Number of common stock sold | shares | 50,000 | |||||
| Subsequent Events [Member] | Lincoln Park Capital Fund, LLC [Member] | ||||||
| Subsequent Event [Line Items] | ||||||
| Number of common stock sold | shares | 35,000 | |||||
| Proceeds from issuance of common stock | $ | $ 82 | |||||