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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]        
Revenues $ 19,816 $ 17,153 $ 58,472 $ 47,053
Costs and expenses        
Costs of revenues 14,483 11,524 44,428 31,538
Research and development 7,193 5,303 20,048 15,045
Selling, general and administrative 7,793 6,056 22,772 15,692
Total costs and expenses 29,469 22,883 87,248 62,275
Loss from operations (9,653) (5,730) (28,776) (15,222)
Interest income 117 756 873 1,040
Interest expense   (204) (2) (1,133)
Loss on debt extinguishment   (1,704)   (1,704)
Other income (expense), net (4) (2) 5 (1,415)
Loss before income taxes (9,540) (6,884) (27,900) (18,434)
Provision for income taxes (5) (1) (39) (5)
Net loss $ (9,545) $ (6,885) $ (27,939) $ (18,439)
Net loss per share, basic and diluted $ (0.27) $ (0.22) $ (0.85) $ (1.35)
Weighted-average shares outstanding, basic and diluted 35,460,092 31,133,683 32,845,583 13,613,444