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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Balance at Mar. 31, 2013 | $ 125,118 | $ 60 | $ 924,390 | $ (313) | $ 1,112 | $ (800,131)
Balance, shares at Mar. 31, 2013 |  | 6,030 |  |  |  |
Issuance of common stock - ESPP | 168 |  | 168 |  |  |
Issuance of common stock - ESPP, shares |  | 10 |  |  |  |
Issuance of common stock - restricted shares | 502 | $ 2 | 500 |  |  |
Issuance of common stock - restricted shares, shares |  | 178 |  |  |  |
Stock-based compensation expense | 10,696 |  | 10,696 |  |  |
Issuance of stock for 401(k) match | 425 |  | 425 |  |  |
Issuance of stock for 401(k) match, shares |  | 21 |  |  |  |
Issuance of common stock-ATM, net of costs | 7,458 | $ 5 | 7,453 |  |  |
Issuance of common stock-ATM, net of costs, shares |  | 487 |  |  |  |
Issuance of common stock to settle liabilities | 23,480 | $ 12 | 23,468 |  |  |
Issuance of common stock to settle liabilities, shares, other |  | 1,167 |  |  |  |
Repurchase of treasury stock | (57) |  |  | (57) |  |
Cumulative translation adjustment | 727 |  |  |  | 727 |
Net loss | (56,258) |  |  |  |  | (56,258)
Balance at Mar. 31, 2014 | 112,259 | $ 79 | 967,100 | (370) | 1,839 | (856,389)
Balance, shares at Mar. 31, 2014 |  | 7,893 |  |  |  |
Issuance of common stock - ESPP | 124 |  | 124 |  |  |
Issuance of common stock - ESPP, shares |  | 17 |  |  |  |
Issuance of common stock - restricted shares |  | $ 3 | (3) |  |  |
Issuance of common stock - restricted shares, shares |  | 301 |  |  |  |
Stock-based compensation expense | 5,936 |  | 5,936 |  |  |
Issuance of stock for 401(k) match | 392 |  | 392 |  |  |
Issuance of stock for 401(k) match, shares |  | 35 |  |  |  |
Issuance of common stock-ATM, net of costs | 5,839 | $ 4 | 5,835 |  |  |
Issuance of common stock-ATM, net of costs, shares |  | 375 |  |  |  |
Issuance of common stock-Hudson Bay Capital | 5,225 | $ 9 | 5,216 |  |  |
Issuance of common stock-Hudson Bay Capital, shares |  | 909 |  |  |  |
Issuance of common stock to settle liabilities | 1,323 | $ 1 | 1,322 |  |  |
Issuance of common stock to settle liabilities, shares, other |  | 94 |  |  |  |
Reverse stock split | (1) |  | (1) |  |  |
Repurchase of treasury stock | (401) |  |  | (401) |  |
Cumulative translation adjustment | (2,147) |  |  |  | (2,147) |
Net loss | (48,656) |  |  |  |  | (48,656)
Balance at Mar. 31, 2015 | 79,893 | $ 96 | 985,921 | (771) | (308) | (905,045)
Balance, shares at Mar. 31, 2015 |  | 9,624 |  |  |  |
Issuance of common stock - ESPP | 30 |  | 30 |  |  |
Issuance of common stock - ESPP, shares |  | 8 |  |  |  |
Issuance of common stock - restricted shares |  | $ 4 | (4) |  |  |
Issuance of common stock - restricted shares, shares |  | 409 |  |  |  |
Stock-based compensation expense | 3,248 |  | 3,248 |  |  |
Issuance of stock for 401(k) match | 377 | $ 1 | 376 |  |  |
Issuance of stock for 401(k) match, shares |  | 66 |  |  |  |
Issuance of common stock-equity offering | 22,282 | $ 40 | 22,242 |  |  |
Issuance of common stock-equity offering, shares |  | 4,000 |  |  |  |
Repurchase of treasury stock | (110) |  |  | (110) |  |
Cumulative translation adjustment | 968 |  |  |  | 968 |
Net loss | (23,139) |  |  |  |  | (23,139)
Balance at Mar. 31, 2016 | $ 83,549 | $ 141 | $ 1,011,813 | $ (881) | $ 660 | $ (928,184)
Balance, shares at Mar. 31, 2016 |  | 14,107 |  |  |  |

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