Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Employee Benefits and Share-Based Compensation - Shared-Based Compensation Expense (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 05, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense		$ 8,505	$ 7,085	$ 25,175	$ 20,851
Unrecognized compensation cost of unvested stock options		700		$ 700
Weighted-average remaining vesting period ( in years )				1 year 10 months 24 days
Cost of product and service revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense		1,316	1,150	$ 4,194	3,346
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense		1,652	1,397	4,938	4,068
Selling, general, and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense		$ 5,537	$ 4,538	$ 16,043	$ 13,437
Equity Compensation
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	$ 200