Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Stock-based compensation expense
Stock-based compensation expense (in dollars)	$ 3,016	$ 131	$ 6,837	$ 258
Cost of revenue - product
Stock-based compensation expense
Stock-based compensation expense (in dollars)	126	29	221	58
Cost of revenue - service
Stock-based compensation expense
Stock-based compensation expense (in dollars)	69	7	112	14
Research and development
Stock-based compensation expense
Stock-based compensation expense (in dollars)	216	10	320	21
Selling and marketing
Stock-based compensation expense
Stock-based compensation expense (in dollars)	165	22	282	44
General and administrative
Stock-based compensation expense
Stock-based compensation expense (in dollars)	$ 2,440	$ 63	$ 5,902	$ 121