Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Sep. 04, 2013 shares	Dec. 31, 2019 USD ($) stock-based_compensation_plan $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award
Number of stock-based compensations plans | stock-based_compensation_plan		2
Shares reserved for issuance (in shares)		34,013,000
Stock compensation expense | $		$ 22,995	$ 24,569	$ 28,248
Expected dividend yield		0.00%
Shares granted during period (in shares)		924,000
Exercise of stock options (in shares)		344,000
2003 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares of common stock which may be granted (in shares)		0
Remaining shares reserved for issuance (in shares)	155,884
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares reserved for issuance (in shares)	1,500,000
Remaining shares reserved for issuance (in shares)		4,634,133
Additional shares authorized under new plan (in shares)	1,344,116
Annual increase in shares authorized under plan, shares threshold (in shares)	3,150,000
Percentage threshold of outstanding shares as of December 31 of each year for calculation of annual increase in authorized shares under the plan	4.00%
2003 and 2013 Plans
Share-based Compensation Arrangement by Share-based Payment Award
Expiration period of options		10 years
Vesting period of stock options and restricted stock awards		4 years
Stock compensation expense | $		$ 1,000	$ 2,400	$ 4,900
Shares granted during period (in shares)		923,508	942,271	701,384
Weighted average grant date fair value (in dollars per share) | $ / shares		$ 23.65	$ 25.05	$ 18.58
Exercise of stock options (in shares)		344,257	779,711	474,056
Total proceeds from options exercised | $		$ 10,100	$ 15,900	$ 3,900
Aggregate intrinsic value of options exercised | $		4,900	19,300	10,200
Unrecognized compensation expense related to unvested stock options | $		$ 28,400
Weighted-average period of recognition (in years)		2 years 4 months 24 days
2013 ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Shares reserved for issuance (in shares)	275,000
Purchase price of common stock expressed as a percentage of the fair value of a share of common stock		85.00%
Stock compensation expense | $		$ 400	$ 400	$ 300
Restricted Stock Units | 2003 and 2013 Plans
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period of stock options and restricted stock awards		3 years
Restricted Stock Units | Certain Individuals
Share-based Compensation Arrangement by Share-based Payment Award
Weighted-average period of recognition (in years)		1 year 9 months 18 days
Unrecognized compensation expense related to unvested restricted stock units | $		$ 10,500
Employee Stock Purchase Plan | 2013 ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Shares reserved for issuance (in shares)		122,589