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Stock-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Option Activity and Related Information |
| Options outstanding |  | Weighted-average exercise price |  | Weighted-average remaining contractual life (in years) |  | Aggregate intrinsic values (in thousands) (1)
Balance as of December 31, 2017 | 2,406,537 |  |  | $ | 6.58 |  |  |  |  |
Exercised | (901,505 | ) |  | 2.54 |  |  |  |  |
Canceled or forfeited | (22,250 | ) |  | 12.95 |  |  |  |  |
Balance as of December 31, 2018 | 1,482,782 |  |  | $ | 8.94 |  |  | 6.3 |  | $ | 7,120 |
Exercisable, December 31, 2018 | 1,068,482 |  |  | $ | 2.00 |  |  | 5.7 |  | $ | 7,120 |
(1)The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the Company's closing stock price of $8.66, as reported on the New York Stock Exchange on December 31, 2018. The following table summarizes the activity for options that vest solely based upon the satisfaction of a service condition as follows:
| Options outstanding |  | Weighted-average exercise price |  | Weighted-average remaining contractual life (in years) |  | Aggregate intrinsic values (in thousands) (1)
Balance as of December 31, 2017 | 2,597,294 |  |  | $ | 10.66 |  |  |  |  |  |
Granted | 585,250 |  |  | 18.43 |  |  |  |  |  |
Exercised | (236,490 | ) |  | 3.75 |  |  |  |  |  |
Canceled or forfeited | (199,384 | ) |  | 10.56 |  |  |  |  |  |
Balance as of December 31, 2018 | 2,746,670 |  |  | $ | 12.91 |  |  | 7.6 |  | $ | 4,880 |
Exercisable, December 31, 2018 | 1,399,451 |  |  | $ | 9.14 |  |  | 6.9 |  | $ | 4,200 |
(1) | The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the Company's closing stock price of $8.66, as reported on the New York Stock Exchange on December 31, 2018.
Summary of Additional Information Relating to Stock Options Activity | Additional information relating to service-based options is as follows (in thousands, except per share data):
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Stock-based compensation expense | $ | 3,219 |  |  | $ | 2,435 |  |  | $ | 4,286 |
Intrinsic value of options exercised | $ | 2,890 |  |  | $ | 12,841 |  |  | $ | 2,486 |
Weighted-average grant date fair value of options granted (per share) | $ | 6.81 |  |  | $ | 9.51 |  |  | $ | 5.07 |
Additional information relating to options that vest based upon the satisfaction of performance or market conditions is as follows (in thousands, except per share data):
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Stock-based compensation expense | $ | 1,168 |  |  | $ | 3,489 |  |  | $ | 1,813 |
Intrinsic value of options exercised | $ | 8,669 |  |  | $ | 42,874 |  |  | $ | — |
Weighted-average grant date fair value of options granted (per share) | $ | — |  |  | $ | 10.65 |  |  | $ | 1.52 |
Summary of Weighted-Average Assumptions | The fair value of service-based stock options granted were calculated using the following weighted-average assumptions:
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Expected term (in years) | 6.3 |  |  | 6.2 |  |  | 5.9 |
Expected volatility | 32.02 | % |  | 32.42 | % |  | 36.50 | %
Risk-free interest rate | 2.68 | % |  | 2.14 | % |  | 1.34 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Summary of Restricted Stock Unit Activity and Related Information | The following table summarizes the activities for restricted stock awards (“RSAs”) and restricted stock units (“RSUs”) as follows:
| Shares of restricted stock outstanding |  | Weighted-average grant date fair value
Balance as of December 31, 2017 | 1,248,824 |  |  | $ | 23.37 |
Granted | 1,331,745 |  |  | 17.73 |
Vested | (376,130 | ) |  | 22.96 |
Canceled or forfeited | (168,315 | ) |  | 20.24 |
Balance as of December 31, 2018 | 2,036,124 |  |  | $ | 20.01 |
Disclosure of Additional Information | Additional information relating to RSAs and RSUs is as follows (in thousands):
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Stock-based compensation expense | $ | 12,434 |  |  | $ | 7,550 |  |  | $ | 700 |
Intrinsic value of RSUs released | $ | 6,280 |  |  | $ | 3,398 |  |  | $ | — |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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