Note N - Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss and Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Net loss - basic and diluted | $ (9,936) | $ (13,414) | $ 9,768 | $ (2,934) | $ (9,203) | $ (9,744) | $ (29,743) | $ (5,974) | $ (16,516) | $ (54,664) | $ (24,455) |
| Weighted-average number of common shares - basic and diluted (in shares) | 14,597,053 | 7,368,681 | 2,381,041 | ||||||||
| Net loss per share - basic and diluted (in dollars per share) | $ (1.13) | $ (7.42) | $ (10.27) | ||||||||