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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Mar. 31, 2014 | $ 48,284 | $ 78 | $ 140,419 | $ (92,213) | $ 0
Beginning balance, Shares at Mar. 31, 2014 |  | 78,113,000 |  |  |
Issuance of common stock from warrant exercises, net | $ 445 | $ 0 | 445 | 0 | 0
Issuance of common stock from warrant exercises, net, Shares | 210,600 | 211,000 |  |  |
Restricted stock forfeitures | $ 0 | $ 0 | 0 | 0 | 0
Restricted stock forfeitures, Shares |  | (190,000) |  |  |
Issuance of common stock from public offering, net | 22,307 | $ 4 | 22,303 | 0 | 0
Issuance of common stock from public offering, Shares |  | 3,198,000 |  |  |
Stock-based compensation expense | 7,020 | $ 0 | 7,020 | 0 | 0
Warrant liability removed due to exercises of warrants | 55 | 0 | 55 | 0 | 0
Stock option exercises | $ 351 | $ 0 | 351 | 0 | 0
Stock option exercises, Shares | 205,684 | 205,000 |  |  |
Issuance of warrants to consultant | $ 316 | $ 0 | 316 | 0 | 0
Net loss | (30,082) | 0 | 0 | (30,082) | 0
Foreign currency translation adjustment | 0 |  |  |  |
Ending balance at Mar. 31, 2015 | 48,696 | $ 82 | 170,909 | (122,295) | 0
Ending balance, Shares at Mar. 31, 2015 |  | 81,537,000 |  |  |
Issuance of common stock from warrant exercises, net | $ 0 | $ 0 | 0 | 0 | 0
Issuance of common stock from warrant exercises, net, Shares | 32,914 | 32,000 |  |  |
Restricted stock forfeitures | $ 0 | $ 0 | 0 | 0 | 0
Restricted stock forfeitures, Shares |  | (132,000) |  |  |
Issuance of common stock from public offering, net | 43,137 | $ 10 | 43,127 | 0 | 0
Issuance of common stock from public offering, Shares |  | 10,839,000 |  |  |
Stock-based compensation expense | 8,556 | $ 0 | 8,556 | 0 | 0
Warrant liability removed due to exercises of warrants | 139 | 0 | 139 | 0 | 0
Stock option exercises | $ 320 | $ 0 | 320 | 0 | 0
Stock option exercises, Shares | 116,001 | 116,000 |  |  |
Issuance of warrants to consultant | $ 38 | $ 0 | 38 | 0 | 0
Adjustment related to potential equity bonus issuance | (130) | 0 | (130) | 0 | 0
Net loss | (38,575) | 0 | 0 | (38,575) | 0
Foreign currency translation adjustment | 0 |  |  |  |
Ending balance at Mar. 31, 2016 | 62,181 | $ 92 | 222,959 | (160,870) | 0
Ending balance, Shares at Mar. 31, 2016 |  | 92,392,000 |  |  |
Issuance of common stock from warrant exercises, net | $ 336 | $ 1 | 335 | 0 | 0
Issuance of common stock from warrant exercises, net, Shares | 700,379 | 700,000 |  |  |
Issuance of common stock under employee and director stock option, RSU and purchase plans | $ 705 | $ 0 | 705 | 0 | 0
Issuance of common stock under employee and director stock option, RSU and purchase plans, Shares |  | 397,000 |  |  |
Issuance of common stock from public offering, net | 30,206 | $ 11 | 30,195 | 0 | 0
Issuance of common stock from public offering, Shares |  | 11,062,000 |  |  |
Stock-based compensation expense | $ 7,392 | $ 0 | 7,392 | 0 | 0
Stock option exercises, Shares | 245,271 |  |  |  |
Net loss | $ (38,447) | 0 | 0 | (38,447) |
Foreign currency translation adjustment | (11) | 0 | 0 | 0 | (11)
Ending balance at Mar. 31, 2017 | $ 62,362 | $ 104 | $ 261,586 | $ (199,317) | $ (11)
Ending balance, Shares at Mar. 31, 2017 |  | 104,551,000 |  |  |

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