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Financial Instruments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Financial Instruments
Transfers between fair value measurement levels	$ 0		$ 0
Cash and cash equivalents:
Cash and cash equivalents	11,652	$ 15,294	$ 17,030
Short-term investments:
Short-term investments	40,012	22,276
Corporate debt securities
Short-term investments:
Short-term investments	2,012	7,276
Reverse repurchase agreements
Short-term investments:
Short-term investments	$ 38,000	15,000
Government Securities and Obligations | Reverse Repurchase Agreement | Minimum
Financial Instruments
Percentage of investment amount to collateralized deposits value	102
Recurring
Assets:
Total assets	$ 48,082	33,180
Recurring | Money market funds
Cash and cash equivalents:
Cash and cash equivalents	3,481	5,956
Recurring | Corporate debt securities
Cash and cash equivalents:
Cash and cash equivalents	2,589	1,948
Short-term investments:
Short-term investments	2,012	7,276
Recurring | Reverse repurchase agreements
Cash and cash equivalents:
Cash and cash equivalents	2,000	3,000
Short-term investments:
Short-term investments	38,000	15,000
Recurring | Level 1
Assets:
Total assets	3,481	5,956
Recurring | Level 1 | Money market funds
Cash and cash equivalents:
Cash and cash equivalents	3,481	5,956
Recurring | Level 2
Assets:
Total assets	44,601	27,224
Recurring | Level 2 | Corporate debt securities
Cash and cash equivalents:
Cash and cash equivalents	2,589	1,948
Short-term investments:
Short-term investments	2,012	7,276
Recurring | Level 2 | Reverse repurchase agreements
Cash and cash equivalents:
Cash and cash equivalents	2,000	3,000
Short-term investments:
Short-term investments	$ 38,000	$ 15,000

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