Adoption of New Accounting Policy - Impact on Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue:
Revenue	$ 43,944	$ 27,977
Cost of revenue, exclusive of depreciation and amortization shown below:
Cost of revenue, exclusive of depreciation and amortization	31,664	19,655
Loss from operations	(15,381)	(2,422)
Net loss	(18,094)	(2,593)
Net loss attributable to common stockholders:
Basic	(18,094)	(2,593)
Diluted	$ (18,094)	$ (2,593)
Net income per share attributable to common stockholders, basic and diluted	$ (0.96)	$ (0.16)
As Previously Reported | ASU 2014-09
Revenue:
Revenue		$ 27,689
Cost of revenue, exclusive of depreciation and amortization shown below:
Cost of revenue, exclusive of depreciation and amortization		19,655
Loss from operations		(2,710)
Net loss		(2,881)
Net loss attributable to common stockholders:
Basic		(2,881)
Diluted		$ (2,881)
Net income per share attributable to common stockholders, basic and diluted		$ (0.18)
Adjustment for ASU on Revenue Recognition | ASU 2014-09
Revenue:
Revenue		$ 288
Cost of revenue, exclusive of depreciation and amortization shown below:
Loss from operations		288
Net loss		288
Net loss attributable to common stockholders:
Basic		288
Diluted		$ 288
Net income per share attributable to common stockholders, basic and diluted		$ 0.02
Product
Revenue:
Revenue	$ 27,180	$ 21,941
Cost of revenue, exclusive of depreciation and amortization shown below:
Cost of revenue, exclusive of depreciation and amortization	20,832	16,892
Product | As Previously Reported | ASU 2014-09
Revenue:
Revenue		22,696
Cost of revenue, exclusive of depreciation and amortization shown below:
Cost of revenue, exclusive of depreciation and amortization		17,405
Product | Adjustment for ASU on Revenue Recognition | ASU 2014-09
Revenue:
Revenue		(755)
Cost of revenue, exclusive of depreciation and amortization shown below:
Cost of revenue, exclusive of depreciation and amortization		(513)
Service
Revenue:
Revenue	16,764	6,036
Cost of revenue, exclusive of depreciation and amortization shown below:
Cost of revenue, exclusive of depreciation and amortization	$ 10,832	2,763
Service | As Previously Reported | ASU 2014-09
Revenue:
Revenue		4,993
Cost of revenue, exclusive of depreciation and amortization shown below:
Cost of revenue, exclusive of depreciation and amortization		2,250
Service | Adjustment for ASU on Revenue Recognition | ASU 2014-09
Revenue:
Revenue		1,043
Cost of revenue, exclusive of depreciation and amortization shown below:
Cost of revenue, exclusive of depreciation and amortization		$ 513