Acquisitions - Summary of Estimated Fair Values of Consideration transferred, Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		Apr. 05, 2019	Feb. 21, 2019	Sep. 30, 2019	Dec. 31, 2018
Liabilities assumed
Goodwill				$ 69,952	$ 12,354
Portfolium
Consideration transferred
Cash paid	[1]		$ 25,552
Common stock			17,133
Fair value of assumed Portfolium awards attributable to pre-combination services			715
Total purchase consideration			43,400
Identifiable assets acquired
Cash			604
Accounts receivable			273
Other assets			31
Total assets acquired			22,194
Liabilities assumed
Accounts payable and accrued liabilities			115
Deferred revenue			1,535
Deferred tax liability, net	[2]		4,191
Total liabilities assumed			5,841
Goodwill	[1],[2]		27,047
Total purchase consideration			(43,400)
Portfolium | Developed Technology
Identifiable assets acquired
Intangible assets			10,016
Portfolium | Customer Relationships
Identifiable assets acquired
Intangible assets			8,560
Portfolium | Trade Name
Identifiable assets acquired
Intangible assets			$ 2,710
MasteryConnect
Consideration transferred
Cash paid		$ 32,462
Common stock		12,163
Total purchase consideration		44,625
Identifiable assets acquired
Cash		2,396
Accounts receivable		495
Other assets		1,919
Total assets acquired		19,110
Liabilities assumed
Accounts payable and accrued liabilities		936
Deferred revenue		3,384
Deferred tax liability, net		716
Total liabilities assumed		5,036
Goodwill		30,551
Total purchase consideration		(44,625)
MasteryConnect | Developed Technology
Identifiable assets acquired
Intangible assets		9,191
MasteryConnect | Customer Relationships
Identifiable assets acquired
Intangible assets		4,453
MasteryConnect | Trade Name
Identifiable assets acquired
Intangible assets		$ 656

[1] During the third quarter of 2019, we recorded a $330,000 reduction to the provisional cash consideration, with a corresponding reduction to goodwill, as a result of finalizing a working capital adjustment. This is included in the non-cash activities of the Consolidated Statements of Cash Flows as the amount was not received as of September 30, 2019.

[2] During the second quarter of 2019, an adjustment of $1,199,000 was made to the provisional deferred tax liability. The deferred tax liability balance will remain provisional until the Portfolium tax return is filed.