Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities by Level within the Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash equivalents and short-term investments	$ 241,738	$ 108,928
Liabilities
Other current liabilities—contingent consideration	3,004	1,316
Fair Value, Recurring
Assets
Total assets at fair value	280,640	96,681
Liabilities
Other current liabilities—contingent consideration	3,004	1,316
Other noncurrent liabilities—contingent consideration	2,411	3,688
Total liabilities at fair value	5,415	5,004
Fair Value, Recurring | Level 1
Assets
Total assets at fair value	280,640	96,681
Liabilities
Other current liabilities—contingent consideration	0	0
Other noncurrent liabilities—contingent consideration	0	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	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	3,004	1,316
Other noncurrent liabilities—contingent consideration	2,411	3,688
Total liabilities at fair value	5,415	5,004
Money market funds
Assets
Cash equivalents and short-term investments	130,640	96,681
Money market funds | Fair Value, Recurring
Assets
Cash equivalents and short-term investments	130,640	96,681
Money market funds | Fair Value, Recurring | Level 1
Assets
Cash equivalents and short-term investments	130,640	96,681
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
Certificates of deposit | Fair Value, Recurring
Assets
Cash equivalents and short-term investments	150,000
Certificates of deposit | Fair Value, Recurring | Level 1
Assets
Cash equivalents and short-term investments	150,000
Certificates of deposit | Fair Value, Recurring | Level 2
Assets
Cash equivalents and short-term investments	0
Certificates of deposit | Fair Value, Recurring | Level 3
Assets
Cash equivalents and short-term investments	$ 0