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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Accounts receivable, net of allowances $ 324 $ 6
Preferred stock, par value (usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (shares) 10,000,000 10,000,000
Preferred stock, shares issued (shares) 0 0
Preferred stock, shares outstanding (shares) 0 0
Common stock, par value (usd per share) $ 0.001 $ 0.001
Common stock, shares authorized (shares) 200,000,000 200,000,000
Common stock, shares issued (shares) 74,115,000 69,956,000
Common stock, shares outstanding (shares) 74,115,000 69,956,000