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Share-Based Payments - Option Rollforward (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning (in shares) | shares	1,040,081
Expired and canceled (in shares) | shares	(1,000)
Forfeited prior to vesting (in shares) | shares	(15,252)
Exercise of stock options (in shares) | shares	(56,143)
Outstanding, ending (in shares) | shares	1,028,935
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, outstanding, beginning (in dollars per share) | $ / shares	$ 5.65
Weighted average exercise price, expired and canceled (in dollars per share) | $ / shares	3.42
Weighted average exercise price, forfeited prior to vesting (in dollars per share) | $ / shares	7.85
Weighted average exercise price, exercised (in dollars per share) | $ / shares	5.51
Weighted average exercise price, outstanding, ending (in dollars per share) | $ / shares	$ 6.03
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Vested (in shares) | shares	820,022
Vested, weighted average exercise price (in dollars per share) | $ / shares	$ 5.10
Vested, weighted average remaining contractual term (in years)	3 years 8 months 26 days
Vested, aggregate intrinsic value (in dollars) | $	$ 6,419
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, weighted average remaining contractual term (in years)	4 years 8 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $	$ 7,104
Initial Stock Option Grants
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (in shares) | shares	56,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, granted (in dollars per share) | $ / shares	$ 13.03
Reinstated Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (in shares) | shares	4,583
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, granted (in dollars per share) | $ / shares	$ 4.47

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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