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CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL DEFICIENCY - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Beginning balance |  | $ (52,881) | $ (29,457) | $ (9,957)
Share-based compensation related to stock options |  | 835 | 498 | 337
Share-based compensation related to restricted stock award |  |  | 16 |
Reclassification of embedded derivative |  |  |  | 43,634
Convertible note conversions |  |  | 1,369 | 18,654
Equity component of convertible notes |  |  |  | 1,315
Convertible note payment |  |  | 1,150 |
Net loss |  | (18,276) | (26,457) | (83,440)
Ending balance |  | (70,322) | (52,881) | (29,457)
Common Stock [Member] |  |  |  |
Beginning balance | [1] | $ 15 | $ 14 | $ 12
Beginning balance (in shares) |  | 14,838,213 | 14,372,880 | 12,413,409
Share-based compensation related to restricted stock award (in shares) |  |  | 2,990 |
Convertible note conversions | [1] |  |  | $ 2
Convertible note conversions (in shares) |  |  | 200,997 | 1,959,471
Convertible note payment | [1] |  | $ 1 |
Convertible note payment (in shares) |  |  | 261,346 |
Ending balance | [1] | $ 15 | $ 15 | $ 14
Ending balance (in shares) |  | 14,838,213 | 14,838,213 | 14,372,880
Additional Paid-in Capital [Member] |  |  |  |
Beginning balance |  | $ 269,657 | $ 266,625 | $ 202,687
Share-based compensation related to stock options |  | 835 | 498 | 337
Share-based compensation related to restricted stock award |  |  | 16 |
Reclassification of embedded derivative |  |  |  | 43,634
Convertible note conversions |  |  | 1,369 | 18,652
Equity component of convertible notes |  |  |  | 1,315
Convertible note payment |  |  | 1,149 |
Ending balance |  | 270,492 | 269,657 | 266,625
Accumulated Deficit [Member] |  |  |  |
Beginning balance |  | (322,553) | (296,096) | (212,656)
Net loss |  | (18,276) | (26,457) | (83,440)
Ending balance |  | $ (340,829) | $ (322,553) | $ (296,096)
[1] | Represents an amount less than $1.

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