Segment Reporting and Geographic Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 Segment Customer	Dec. 31, 2017 Customer	Dec. 31, 2016
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	1
Customer Concentration Risk [Member] | Revenue [Member]
Segment Reporting Information [Line Items]
Segment reporting, disclosure of major customer		No individual end user customer accounted for more than 10% of the Company’s revenue in 2017 and 2016. The Company does not have purchase contracts with any of its customers that obligate them to continue to purchase its products.	No individual end user customer accounted for more than 10% of the Company’s revenue in 2017 and 2016. The Company does not have purchase contracts with any of its customers that obligate them to continue to purchase its products.
Customer Concentration Risk [Member] | Revenue [Member] | SK Hynix Inc. [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	12.20%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	10.00%
Number of major customer | Customer	0	0