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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 Deficit | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2012 | $ 85,447 | $ 34 | $ 438,477 | $ (25,000) | $ (328,078) | $ 14 | $ 0
Beginning Balance, shares at Dec. 31, 2012 |  | 33,655 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (43,413) |  |  |  | (43,413) |  |
Other comprehensive loss | (9) |  |  |  |  | (9) |
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares) |  | 442 |  |  |  |  |
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP | 102 |  | 102 |  |  |  |
Taxes withheld on net settled vesting of restricted stock units | (654) |  | (654) |  |  |  |
Share-based compensation | 3,443 |  | 3,443 |  |  |  |
Ending Balance at Dec. 31, 2013 | 44,916 | $ 34 | 441,368 | (25,000) | (371,491) | 5 | 0
Ending Balance, shares at Dec. 31, 2013 |  | 34,097 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (39,229) |  |  |  | (39,229) |  |
Other comprehensive loss | (5) |  |  |  |  | (5) |
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares) |  | 689 |  |  |  |  |
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP | 248 | $ 2 | 246 |  |  |  |
Taxes withheld on net settled vesting of restricted stock units | (1,067) |  | (1,067) |  |  |  |
Issuance of common stock in connection with litigation settlement (in shares) |  | 2,407 |  |  |  |  |
Issuance of common stock in connection with litigation settlement | 5,000 | $ 2 | 4,998 |  |  |  |
Issuance of common stock in connection with the conversion of convertible securities (in shares) |  | 872 |  |  |  |  |
Issuance of common stock in connection with the conversion of convertible securities | 940 | $ 1 | 939 |  |  |  |
Issuance of common stock (in shares) |  | 7,363 |  |  |  |  |
Issuance of common stock | 7,936 | $ 7 | 7,929 |  |  |  |
Beneficial conversion feature of convertible Series C preferred stock | 0 |  | 445 |  | (445) |  |
Reclassification of warrant liability | 8,219 |  | 8,219 |  |  |  |
Share-based compensation (in shares) |  | 314 |  |  |  |  |
Share-based compensation | 3,588 |  | 3,588 |  |  |  |
Ending Balance at Dec. 31, 2014 | 30,546 | $ 46 | 466,665 | $ (25,000) | (411,165) | 0 | 0
Ending Balance, shares at Dec. 31, 2014 |  | 45,742 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (52,294) |  |  |  | (52,286) |  | (8)
Other comprehensive loss | (8,507) |  |  |  |  | (8,507) |
Noncontrolling interest acquired in Ctrack acquisition | 39 |  |  |  |  |  | 39
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP (in shares) |  | 1,257 |  |  |  |  |
Exercise of stock options, vesting of restricted stock units and stock issued under ESPP | 1,764 | $ 1 | 1,763 |  |  |  |
Taxes withheld on net settled vesting of restricted stock units | (757) |  | (757) |  |  |  |
Issuance of common stock in connection with the conversion of convertible securities (in shares) |  | 3,825 |  |  |  |  |
Issuance of common stock in connection with the conversion of convertible securities | 8,644 | $ 4 | 8,640 |  |  |  |
Issuance of common stock (in shares) |  | 2,158 |  |  |  |  |
Issuance of common stock | 5,750 | $ 2 | 5,748 |  |  |  |
Share-based compensation (in shares) |  | 183 |  |  |  |  |
Share-based compensation | 6,350 |  | 6,350 |  |  |  |
Discount on convertible senior notes | 38,305 |  | 38,305 |  |  |  |
Fair value of DigiCore replacement options granted | $ 623 |  | $ 623 |  |  |  |
Retirement of treasury stock | 0 |  | (25,000) | 25,000 |  |  |
Ending Balance at Dec. 31, 2015 | $ 30,463 | $ 53 | $ 502,337 | $ 0 | $ (463,451) | $ (8,507) | $ 31
Ending Balance, shares at Dec. 31, 2015 |  | 53,165 |  |  |  |  |

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