Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for credit loss, current $ 34 $ 34
Preferred stock, par value (usd per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (shares) 5,000,000 5,000,000
Preferred stock, shares issued (shares) 0 0
Preferred stock, shares outstanding (shares) 0 0
Common stock, par value (usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (shares) 100,000,000 100,000,000
Common stock, shares issued (shares) 58,877,000 54,065,000
Common stock, shares outstanding (shares) 58,877,000 54,065,000