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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Accumulated depreciation and amortization $ 2,920 $ 4,557
Preferred stock par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares outstanding (in shares) 0 0
Common stock par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 22,322,022 21,943,872
Common stock, shares outstanding (in shares) 22,024,675 21,809,164