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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 112,017 | $ 415 | $ 114,032 | $ (2,430)
Balance (in shares) at Dec. 31, 2016 |  | 41,465,820 |  |
Issuance of common stock upon exercise of stock options and warrants | 807 | $ 12 | 795 | 0
Issuance of common stock upon exercise of stock options and warrants (in shares) |  | 1,207,729 |  |
Tax withholdings related to net share settlements of stock option awards | (2,026) | $ (3) | (2,023) | 0
Tax withholdings related to net share settlements of stock option awards (in shares) |  | (281,645) |  |
Issuance of common stock for services | 47 | $ 0 | 47 | 0
Issuance of common stock for services (in shares) |  | 6,236 |  |
Value of share based arrangements | 1,451 | $ 0 | 1,451 | 0
Value of share based arrangements (in shares) |  | 0 |  |
Net income (loss) | 11,157 | $ 0 | 0 | 11,157
Balance at Dec. 31, 2017 | 123,453 | $ 424 | 114,302 | 8,727
Balance (in shares) at Dec. 31, 2017 |  | 42,398,140 |  |
Issuance of common stock upon exercise of stock options and warrants | 17 |  | 17 | 0
Issuance of common stock upon exercise of stock options and warrants (in shares) |  | 5,000 |  |
Issuance of common stock for services | 348 | $ 2 | 346 | 0
Issuance of common stock for services (in shares) |  | 196,291 |  |
Value of share based arrangements | 286 |  | 286 |
Net income (loss) | (47,552) | $ 0 | 0 | (47,552)
Balance at Sep. 30, 2018 | $ 76,552 | $ 426 | $ 114,951 | $ (38,825)
Balance (in shares) at Sep. 30, 2018 |  | 42,599,431 |  |

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