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Summary of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information [Line Items]
Revenue									$ 76,051	$ 51,326	$ 39,275
Gross profit	$ 8,083	$ 7,257	$ 7,700	$ 6,234	$ 7,111	$ 5,449	$ 5,165	$ 3,312	29,274	21,037	16,888
Net loss	$ (16,205)	$ (14,192)	$ (13,282)	$ (13,885)	$ (11,486)	$ (13,418)	$ (17,083)	$ (18,598)	$ (57,564)	$ (60,585)	$ (62,906)
Basic	$ (0.12)	$ (0.11)	$ (0.10)	$ (0.11)	$ (0.10)	$ (0.12)	$ (0.16)	$ (0.18)	$ (0.44)	$ (0.56)	$ (0.62)
Diluted	$ (0.12)	$ (0.11)	$ (0.10)	$ (0.11)	$ (0.10)	$ (0.12)	$ (0.16)	$ (0.18)	$ (0.44)	$ (0.56)	$ (0.62)
Product
Quarterly Financial Information [Line Items]
Revenue	$ 16,525	$ 15,399	$ 15,420	$ 13,564	$ 16,240	$ 10,797	$ 9,525	$ 7,006	$ 60,908	$ 43,568	$ 37,183
Government Contract
Quarterly Financial Information [Line Items]
Revenue	$ 3,713	$ 3,928	$ 4,047	$ 3,455	$ 2,378	$ 2,285	$ 1,667	$ 1,428	$ 15,143	$ 7,758	$ 2,092

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