Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Statement Of Income And Comprehensive Income [Abstract] | ||||
| Net loss | $ (12,317) | $ (10,212) | $ (40,646) | $ (40,856) |
| Other comprehensive gain (loss): | ||||
| Unrealized loss on marketable securities | (9) | (9) | (1) | |
| Comprehensive loss | $ (12,326) | $ (10,212) | $ (40,655) | $ (40,857) |