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Capital Stock - Additional Information, Stock-based compensation (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted (in shares) | 2,525,000 | 1,052,000 | 732,000
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 1.53 | $ 4.21 | $ 4.71
Common stock conversion (in shares) | 1 |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares reserved for issuance upon exercise of options or equity awards granted or to be granted | 5,606,429 | 5,777,326 |
Stock options granted (in shares) | 2,525,113 | 1,048,916 | 732,314
Stock option, term (in years) | 10 years |  |
Vesting period (in years) | 3 years |  |
Unrecognized compensation cost related to non-vested stock options granted under the Plans | $ 3,000,000 |  |
Expected recognition of compensation related to non-vested stock options granted under the Plans over next twelve months | 1,900,000 |  |
Expected recognition of compensation related to non-vested stock options granted under the Plans in year two | 1,000,000 |  |
Expected recognition of compensation related to non-vested stock options granted under the Plans in year three | 200,000 |  |
Compensation costs | 3,000,000 | $ 2,800,000 | $ 1,700,000
Intrinsic value of options exercised | 0 | 0 | $ 30,000
Intrinsic value of outstanding in-the-money stock options | $ 3,344,456 | $ 0 |
Weighted-average remaining life (in years) | 7 years 3 months | 6 years 8 months |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 1.53 | $ 4.21 | $ 4.71
Expected volatility used in computing fair value of options granted | 65.20% | 64.80% | 62.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 5 years 6 months | 5 years 6 months | 6 years
Dividend yield used in computing fair value of options granted | 5.90% | 2.50% | 2.50%
Risk-free interest rate used in computing fair value of options granted | 2.50% | 2.60% | 2.00%
Estimated forfeiture rate used in computing fair value of options granted | 6.00% | 7.40% | 7.00%
Period of historical data used to calculate expected volatility (in years) | 5 years |  |
Stock Options | Nonvested |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value of non-vested options forfeited | $ 400,000 | $ 100,000 | $ 200,000
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 3 years |  |
Number of shares or units granted equity based compensation awards | 808,391 | 625,878 | 349,175
Fair value of granted stock | $ 3,200,000 | $ 5,400,000 | $ 3,600,000
Vested restricted stock (in shares) | 880,871 | 563,588 | 129,106
Market value of vested restricted stock | $ 18,100,000 | $ 15,200,000 | $ 3,200,000
Restricted Stock Units and Performance Share Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock granted (in shares) | 483,431 | 311,124 | 73,078
Share based compensation expense | $ 3,300,000 | $ 3,000,000 | $ 4,000,000
Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation costs | $ 400,000 | $ 700,000 | $ 900,000
Number of shares or units granted equity based compensation awards | 111,808 | 79,869 | 89,387

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