Acquisitions - Additional Information (Details) - USD ($)	Oct. 26, 2018	Aug. 27, 2018	Jun. 01, 2018	Sep. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Contingent consideration, fair value				$ 3,015,000	$ 28,963,000
Goodwill deductible for income tax purposes				0
Elevaate
Business Acquisition [Line Items]
Total preliminary acquisition consideration	$ 13,300,000
Cash payments for purchase of assets	7,200,000
Contingent consideration payable in cash	18,500,000
Contingent consideration, fair value	$ 6,100,000
Contingent consideration, milestones achievement period start date	Feb. 01, 2019
Contingent consideration, milestones achievement period end date	Jan. 31, 2021
SavingStar, Inc
Business Acquisition [Line Items]
Cash payments for purchase of assets		$ 7,500,000
Contingent consideration payable in cash		10,600,000
Contingent consideration, fair value		$ 0		$ 0
Contingent consideration, milestones achievement period end date		Feb. 29, 2020
Ahalogy
Business Acquisition [Line Items]
Total preliminary acquisition consideration			$ 36,400,000
Cash payments for purchase of assets			21,800,000
Contingent consideration payable in cash			30,000,000.0
Contingent consideration, fair value			$ 14,600,000
Contingent consideration, milestones achievement period end date			Dec. 31, 2019