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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Statement of Financial Position [Abstract] |  |  |
Unbilled receivables | $ 112 | $ 4,021 | $ 681
Accounts receivables, allowance for doubtful accounts | $ 189 | $ 0 | $ 161
Redeemable Series A preferred stock, par value |  | $ 0.001 | $ 0.001
Redeemable Series A preferred stock, shares authorized |  | 100,000 | 100,000
Redeemable Series A preferred stock, shares issued |  | 35,552 | 30,687
Redeemable Series A preferred stock, shares outstanding |  | 35,552 | 30,687
Common stock, par value | $ 0.001 | $ 0.001 | $ 0.001
Common stock, shares authorized | 33,000,000 | 33,000,000 | 33,000,000
Common stock, shares issued | 22,229,570 | 22,139,480 | 22,039,600
Common stock, shares outstanding | 22,188,543 | 22,114,620 | 22,039,380
Treasury stock, shares | 41,027 | 24,860 | 220

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