Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the condensed consolidated balance sheets that sum to the total of the same amounts shown in the condensed consolidated statements of cash flows:

	September 30, 2018		December 31, 2017
	(unaudited)
	(in thousands)
Cash and cash equivalents	$	113,957	$	72,280
Restricted cash	422		316
Total cash and cash equivalents and restricted cash	$	114,379	$	72,596

Schedules of Concentration of Risk, by Risk Factor

For each significant customer, revenue as a percentage of revenue and accounts receivable as a percentage of accounts receivable are as follows:

	Revenue								Accounts Receivable
	Three Months Ended September 30,				Nine Months Ended September 30,				September 30, 2018		December 31, 2017
	2018		2017		2018		2017
	(unaudited)								(unaudited)
Customer A	*		16	%	10	%	15	%	*		*
Customer B	18	%	13	%	14	%	13	%	30	%	24	%
Customer C	*		*		*		*		*		23	%
Customer D	*		*		*		*		10	%	13	%

* less than 10%