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Financial Instruments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financial Instruments
Transfers between fair value measurement levels	$ 0		$ 0
Cash and cash equivalents:
Cash and cash equivalents	$ 49,931	$ 16,369	$ 29,369
Government Securities and Obligations | Reverse Repurchase Agreement | Minimum
Financial Instruments
Percentage of investment amount to collateralized deposits value	102.00%
Recurring
Assets:
Total assets	$ 44,657	13,588
Recurring | Money market funds
Cash and cash equivalents:
Cash and cash equivalents	41,657	13,588
Recurring | U.S. reverse repurchase agreements
Cash and cash equivalents:
Cash and cash equivalents	3,000
Recurring | Level 1
Assets:
Total assets	41,657	13,588
Recurring | Level 1 | Money market funds
Cash and cash equivalents:
Cash and cash equivalents	41,657	$ 13,588
Recurring | Level 2
Assets:
Total assets	3,000
Recurring | Level 2 | U.S. reverse repurchase agreements
Cash and cash equivalents:
Cash and cash equivalents	$ 3,000

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