Business Acquisitions - VIEVU, LLC. Acquisition (Details) - USD ($)		8 Months Ended	12 Months Ended
	May 03, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill		$ 24,981,000	$ 24,981,000	$ 14,927,000
VIEVU
Business Acquisition [Line Items]
Cash consideration	$ 5,000,000
Net of cash acquired	100,000
Stock options transferred	$ 2,400,000
Shares transferred (in shares)	58,843
Contingent consideration	$ 6,000,000.0
Contingent consideration (in shares)	141,226
Contingent consideration, fair value	$ 5,800,000
Intangible assets, weighted average useful life			5 years 1 month 6 days
Revenue		6,700,000	$ 423,890,000	352,985,000
Direct costs incurred		16,900,000
(Loss) from operations			(27,035,000)	$ 2,145,000
Incurred and expensed costs		800,000	800,000
Expenses subsequent to acquisition date			1,200,000
Tax deductible goodwill		5,200,000	5,200,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable	1,776,000
Inventory	2,626,000
Property and equipment	362,000
Property and equipment	459,000
Contract assets	1,472,000
Developed technology	4,510,000
Goodwill	10,285,000
Accounts payable and accrued liabilities	(3,345,000)
Deferred revenue	(543,000)
Total purchase price	$ 17,602,000
Supply Agreement | VIEVU
Business Acquisition [Line Items]
Fair value of intangibles		$ 4,500,000	$ 4,500,000