Certain Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Contract assets (1)	[1]	$ 13,969	$ 3,834
French R&D tax credits receivable (2)	[2]	7,343	7,305
Deferred cost of revenue		2,631	3,671
Prepaid maintenance, royalty, rent, and property taxes		1,594	3,497
Capitalized commission		1,309	1,098
Other		13,916	3,875
Prepaid Expense and Other Assets, Total		$ 40,762	$ 23,280

[1] Contract assets reflect the satisfied performance obligations for which the Company does not yet have an unconditional right to consideration.

[2] The Company’s French Subsidiary participates in the French Crédit d’Impôt Recherche (“CIR”) program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of R&D tax credits recoverable are subject to audit by the French government and during the year ended December 31, 2019 and 2018, the French government approved the 2015 and 2014 claims and refunded $6.4 million to the French Subsidiary in each of the periods, respectively. The remaining R&D tax credits receivable at December 31, 2019 were approximately $23.2 million and are expected to be recoverable from 2020 through 2023 with $7.3 million reported as a component of “Prepaid and other Current Assets” and $15.9 million reported as a component of “Other Long-term Assets” on the Company’s Consolidated Balance Sheets.