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UNAUDITED QUARTERLY DATA - Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2019
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 38,225 | $ 37,646 | $ 34,406 | $ 33,522 | $ 42,125 | $ 33,592 | $ 31,532 | $ 25,259 | $ 31,779 | $ 26,301 | $ 21,787 | $ 21,569 | $ 56,791 | $ 43,356 | $ 90,383 | $ 69,657 | $ 143,799 | $ 132,508 | $ 101,436 |
Gross profit | 8,987 | 9,779 | 9,243 | 10,110 | 10,478 | 9,845 | 9,172 | 6,181 | 5,977 | 6,342 | 6,445 | 6,297 | 15,353 | 12,742 | 25,198 | 19,084 | 38,119 | 35,676 | 25,061 |
Operating (loss) income | (10,143) | (3,892) | (10,200) | (5,921) | (1,002) | (2,566) | (3,905) | (1,750) | (2,401) | (459) | 109 | (1,383) | (5,655) | (1,274) | (8,221) | (1,733) | (30,156) | (9,223) | (4,134) |
Net income (loss) | (10,541) | (4,510) | (10,657) | (6,320) | (1,696) | (3,223) | (4,194) | (2,171) | (2,938) | (925) | (232) | (3,370) | (6,365) | (3,602) | (9,588) | (4,527) | (32,028) | (11,284) | (7,465) | $ (50,800)
Cumulative preferred dividends | 0 | (334) | 0 | (334) | 0 | (334) | 0 | (334) | 0 | (334) | 0 | (334) | (334) | (334) | (668) | (668) | (668) | (668) | (668) |
Net (loss) income applicable to common shares | $ (10,541) | $ (4,844) | $ (10,657) | $ (6,654) | $ (1,696) | $ (3,557) | $ (4,194) | $ (2,505) | $ (2,938) | $ (1,259) | $ (232) | $ (3,704) | $ (6,699) | $ (3,936) | $ (10,256) | $ (5,195) | $ (32,696) | $ (11,952) | $ (8,133) |
Net earnings (loss) per common share - basic (in USD per share) | $ (0.18) | $ (0.08) | $ (0.18) | $ (0.11) | $ (0.03) | $ (0.07) | $ (0.08) | $ (0.05) | $ (0.07) | $ (0.03) | $ (0.01) | $ (0.10) | $ (0.13) | $ (0.10) | $ (0.20) | $ (0.13) | $ (0.54) | $ (0.23) | $ (0.20) |
Net earnings (loss) per common share - diluted (in USD per share) | $ (0.18) | $ (0.08) | $ (0.18) | $ (0.11) | $ (0.03) | $ (0.07) | $ (0.08) | $ (0.05) | $ (0.07) | $ (0.03) | $ (0.01) | $ (0.10) | $ (0.13) | $ (0.10) | $ (0.20) | $ (0.13) | $ (0.54) | $ (0.23) | $ (0.20) |
Weighted average number of common shares outstanding - basic (in shares) | 60,065,978 | 60,065,053 | 60,059,936 | 60,053,912 | 54,064,750 | 53,637,085 | 52,150,106 | 47,573,364 | 40,331,993 | 40,327,697 | 40,308,934 | 38,488,005 | 49,861,735 | 39,398,469 | 51,101,813 | 39,703,690 | 60,061,243 | 51,840,518 | 39,860,335 |
Weighted average number of common shares outstanding - diluted (in shares) | 60,065,978 | 60,065,053 | 60,059,936 | 60,053,912 | 54,064,750 | 53,637,085 | 52,150,106 | 47,573,364 | 40,331,993 | 40,327,697 | 40,308,934 | 38,488,005 | 49,861,735 | 39,398,469 | 51,101,813 | 39,703,690 | 60,061,243 | 51,840,518 | 39,860,335 |

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