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Net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Feb. 10, 2020 | Dec. 31, 2019 | Apr. 15, 2019 | Dec. 31, 2018
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |
Net loss | $ (10,910) | $ (2,729) |  |  |  |
Basic: |  |  |  |  |  |
Shares outstanding at beginning of period (in shares) |  |  |  | 16,629,000 |  | 16,041,000
Weighted average shares issued/(repurchased) during the period, net (in shares) | 1,312,000 | 3,000 |  |  |  |
Weighted average common shares, basic (in shares) | 17,941,000 | 16,044,000 |  |  |  |
Net loss per common share, basic (in dollars per shares) | $ (0.61) | $ (0.17) |  |  |  |
Diluted: |  |  |  |  |  |
Weighted average common shares, basic (in shares) | 17,941,000 | 16,044,000 |  |  |  |
Weighted average common shares, diluted (in shares) | 17,941,000 | 16,044,000 |  |  |  |
Net loss per common share, diluted (in dollars per share) | $ (0.61) | $ (0.17) |  |  |  |
Convertible Notes | Convertible Senior Notes due 2024 |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Initial conversion price |  |  |  |  | $ 28.55 |
Convertible Notes | Convertible Senior Notes Due 2026 |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Initial conversion price |  |  | $ 42.97 |  |  |
Stock options |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Anti-dilutive stock options outstanding (in shares) | 951,000 | 486,000 |  |  |  |
Stock options | Convertible Notes | Convertible Senior Notes due 2024 |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Anti-dilutive stock options outstanding (in shares) | 481,548 |  |  |  |  |
Stock options | Convertible Notes | Convertible Senior Notes Due 2026 |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Anti-dilutive stock options outstanding (in shares) | 2,792,664 |  |  |  |  |

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