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Common stock, treasury stock and warrants - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2017 | Jun. 30, 2019 | Dec. 31, 2018 | Jul. 09, 2018
Equity [Line Items] |  |  |  |
Common stock, shares issued (in shares) |  | 78,534,774 | 76,525,581 |
Treasury stock, shares (in shares) |  | 1,785,489 | 1,233,198 |
Treasury stock, value |  | $ 6,351 | $ 3,272 |
Warrants outstanding (in shares) |  | 2,398,776 | 2,498,776 |
Common stock, par value (in usd per share) |  | $ 0.0005 | $ 0.0005 |
Reclassification of puttable option from liability to equity |  | $ 1,150 |  |
Minimum |  |  |  |
Equity [Line Items] |  |  |  |
Exercise price of warrants (in usd per share) |  | $ 3.75 |  |
Maximum |  |  |  |
Equity [Line Items] |  |  |  |
Exercise price of warrants (in usd per share) |  | $ 6 |  |
Restricted Stock Units |  |  |  |
Equity [Line Items] |  |  |  |
Shares issued from vesting (in shares) |  | 2,009,193 |  |
Common shares withheld to pay withholding taxes (in shares) |  | 552,291 |  |
HIG Whitehorse SMAABFLP | Whitehorse Warrants |  |  |  |
Equity [Line Items] |  |  |  |
Exercise price of warrants (in usd per share) |  |  |  | $ 3.00
Number of securities called by warrants or rights (in shares) |  |  |  | 46,667
Common stock, par value (in usd per share) |  |  |  | $ 0.0005
HIG Whitehorse SMA Holdings ILLC | Whitehorse Warrants |  |  |  |
Equity [Line Items] |  |  |  |
Exercise price of warrants (in usd per share) |  |  |  | $ 3.00
Number of securities called by warrants or rights (in shares) |  |  |  | 66,666
Whitehorse Finance Inc | Whitehorse Warrants |  |  |  |
Equity [Line Items] |  |  |  |
Exercise price of warrants (in usd per share) |  |  |  | $ 3.00
Number of securities called by warrants or rights (in shares) |  |  |  | 186,667
Put Rights | Whitehorse Warrants |  |  |  |
Equity [Line Items] |  |  |  |
Exercise price of warrants (in usd per share) |  |  |  | $ 3.8334
Warrants |  |  |  |
Equity [Line Items] |  |  |  |
Exercises in period (in shares) | 300,000 |  |  |
Additional Paid-in Capital |  |  |  |
Equity [Line Items] |  |  |  |
Reclassification of puttable option from liability to equity |  | $ 1,150 |  |

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