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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]                    
Revenue $ 8,387 $ 10,347 $ 8,424 $ 5,370 $ 5,673 $ 5,625 $ 5,400 $ 4,653 $ 32,528 $ 21,351
Cost of revenue 3,634 3,885 3,620 2,968 2,769 2,612 2,544 2,772 14,107 10,697
Gross profit 4,753 6,462 4,804 2,402 2,904 3,013 2,856 1,881 18,421 10,654
Operating expenses:                    
Research and development 1,795 1,744 1,574 1,424 1,426 1,438 1,212 1,458 6,537 5,534
Selling and marketing 1,635 1,687 1,304 1,272 1,128 1,115 1,279 1,130 5,898 4,652
General and administrative 1,732 1,522 1,631 1,529 1,379 1,306 1,366 1,487 6,414 5,538
Total operating expenses 5,162 4,953 4,509 4,225 3,933 3,859 3,857 4,075 18,849 15,724
Operating income (loss) (409) 1,509 295 (1,823) (1,029) (846) (1,001) (2,194) (428) (5,070)
Interest and other income, net 249 189 192 207 98 143 98 95 837 434
Income (loss) before income taxes and equity loss in investee (160) 1,698 487 (1,616) (931) (703) (903) (2,099) 409 (4,636)
Provision for income taxes (38) 61 7 13 888 (318) (100) (434) 43 36
Income (loss) before equity loss in investee (122) 1,637 480 (1,629) (1,819) (385) (803) (1,665) 366 (4,672)
Equity loss in investee (174) (175) (149) (279) (234) (210) (246) (245) (777) (935)
Net income (loss) $ (296) $ 1,462 $ 331 $ (1,908) $ (2,053) $ (595) $ (1,049) $ (1,910) $ (411) $ (5,607)
Net loss per common share:                    
Basic $ (0.01) $ 0.08 $ 0.02 $ (0.10) $ (0.11) $ (0.03) $ (0.06) $ (0.11) $ (0.02) $ (0.31)
Diluted $ (0.01) $ 0.08 $ 0.02 $ (0.10) $ (0.11) $ (0.03) $ (0.06) $ (0.11) $ (0.02) $ (0.31)
Weighted-average common shares:                    
Basic                 18,709 17,978
Diluted                 18,709 17,978