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Consolidated Statements of Stockholders' Equity - USD ($) | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2017 | $ 51,000 | $ 145,639,000 | $ (121,340,000) | $ (7,000) | $ 24,343,000
Balances (in shares) at Dec. 31, 2017 | 5,073,669 |  |  |  |
Grant of restricted stock awards (in shares) | 12,331 |  |  |  |
Forfeiture of restricted stock awards (in shares) | (20,928) |  |  |  |
Stock-based compensation |  | 47,000 |  |  | 47,000
Net loss |  |  | (15,601,000) |  | (15,601,000)
Unrealized gain on available-for-sale securities |  |  |  | $ 7,000 | 7,000
Balances at Sep. 30, 2018 | $ 51,000 | 145,686,000 | (136,941,000) |  | 8,796,000
Balances (in shares) at Sep. 30, 2018 | 5,065,072 |  |  |  |
Balances at Jun. 30, 2018 | $ 51,000 | 145,678,000 | (134,170,000) |  | 11,559,000
Balances (in shares) at Jun. 30, 2018 | 5,068,547 |  |  |  |
Forfeiture of restricted stock awards (in shares) | (3,475) |  |  |  |
Stock-based compensation |  | 8,000 |  |  | 8,000
Net loss |  |  | (2,771,000) |  | (2,771,000)
Balances at Sep. 30, 2018 | $ 51,000 | 145,686,000 | (136,941,000) |  | 8,796,000
Balances (in shares) at Sep. 30, 2018 | 5,065,072 |  |  |  |
Balances at Dec. 31, 2018 | $ 51,000 | 145,685,000 | (138,042,000) |  | 7,694,000
Balances (in shares) at Dec. 31, 2018 | 5,069,633 |  |  |  |
Forfeiture of restricted stock awards |  | (39,000) |  |  | (39,000)
Forfeiture of restricted stock awards (in shares) | (32,714) |  |  |  |
Issuance of common stock and conversion of deferred consideration for asset acquisition | $ 5,000 | 1,457,000 |  |  | 1,462,000
Issuance of common stock and conversion of deferred consideration for asset acquisition (in shares) | 516,976 |  |  |  |
Issuance of common stock in connection with reverse merger | $ 23,000 | 10,686,000 |  |  | 10,709,000
Issuance of common stock in connection with reverse merger (in shares) | 2,389,135 |  |  |  |
Sale of common stock, net of issuance costs | $ 20,000 | 9,955,000 |  |  | 9,975,000
Sale of common stock, net of issuance costs (in shares) | 1,991,269 |  |  |  |
Stock-based compensation |  | 3,224,000 |  |  | 3,224,000
Net loss |  |  | (14,893,000) |  | (14,893,000)
Balances at Sep. 30, 2019 | $ 99,000 | 170,968,000 | (152,935,000) |  | 18,132,000
Balances (in shares) at Sep. 30, 2019 | 9,934,299 |  |  |  |
Balances at Jun. 30, 2019 | $ 99,000 | 168,509,000 | (145,980,000) |  | 22,628,000
Balances (in shares) at Jun. 30, 2019 | 9,958,546 |  |  |  |
Forfeiture of restricted stock awards |  | (39,000) |  |  | (39,000)
Forfeiture of restricted stock awards (in shares) | (24,247) |  |  |  |
Stock-based compensation |  | 2,498,000 |  |  | 2,498,000
Net loss |  |  | (6,955,000) |  | (6,955,000)
Balances at Sep. 30, 2019 | $ 99,000 | $ 170,968,000 | $ (152,935,000) |  | $ 18,132,000
Balances (in shares) at Sep. 30, 2019 | 9,934,299 |  |  |  |

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