Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities by Level within the Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash equivalents and short-term investments	$ 218,228	$ 241,738
Liabilities
Other current liabilities—contingent consideration	2,915	3,004
Fair Value, Recurring
Assets
Total assets at fair value	255,566	280,640
Liabilities
Other current liabilities—contingent consideration	2,915	3,004
Other noncurrent liabilities—contingent consideration		2,411
Total liabilities at fair value	2,915	5,415
Fair Value, Recurring | Level 1
Assets
Total assets at fair value	255,566	280,640
Liabilities
Other current liabilities—contingent consideration	0	0
Other noncurrent liabilities—contingent consideration		0
Total liabilities at fair value	0	0
Fair Value, Recurring | Level 2
Assets
Total assets at fair value	0	0
Liabilities
Other current liabilities—contingent consideration	0	0
Other noncurrent liabilities—contingent consideration		0
Total liabilities at fair value	0	0
Fair Value, Recurring | Level 3
Assets
Total assets at fair value	0	0
Liabilities
Other current liabilities—contingent consideration	2,915	3,004
Other noncurrent liabilities—contingent consideration		2,411
Total liabilities at fair value	2,915	5,415
Money market funds
Assets
Cash equivalents and short-term investments	105,566	130,640
Money market funds | Fair Value, Recurring
Assets
Cash equivalents and short-term investments	105,566	130,640
Money market funds | Fair Value, Recurring | Level 1
Assets
Cash equivalents and short-term investments	105,566	130,640
Money market funds | Fair Value, Recurring | Level 2
Assets
Cash equivalents and short-term investments	0	0
Money market funds | Fair Value, Recurring | Level 3
Assets
Cash equivalents and short-term investments	0	0
Certificate of deposit | Fair Value, Recurring
Assets
Cash equivalents and short-term investments	150,000	150,000
Certificate of deposit | Fair Value, Recurring | Level 1
Assets
Cash equivalents and short-term investments	150,000	150,000
Certificate of deposit | Fair Value, Recurring | Level 2
Assets
Cash equivalents and short-term investments		0
Certificate of deposit | Fair Value, Recurring | Level 3
Assets
Cash equivalents and short-term investments	$ 0	$ 0