Fair Value Measurements - Available for Sale Investments at Fair Value (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 137,467	$ 204,133
Gross Unrealized Gains	353	51
Gross Unrealized Losses	(2)	(82)
Fair Value	$ 137,818	$ 204,102
Minimum [Member]
Debt Securities, Available-for-sale [Line Items]
Remaining maturity	3 months	3 months
Maximum [Member]
Debt Securities, Available-for-sale [Line Items]
Remaining maturity	2 years	2 years
U.S. Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 45,695	$ 71,480
Gross Unrealized Gains	143	20
Gross Unrealized Losses	0	(17)
Fair Value	45,838	71,483
U.S. Government Agencies [Member] \| Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Money market funds		3,000
Commercial Paper [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,291	57,554
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Fair Value	17,292	57,554
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45,483	48,532
Gross Unrealized Gains	124	15
Gross Unrealized Losses	(1)	(52)
Fair Value	45,606	48,495
Agency Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,026	19,077
Gross Unrealized Gains	72	16
Gross Unrealized Losses	0	(6)
Fair Value	21,098	19,087
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,972	7,490
Gross Unrealized Gains	13	0
Gross Unrealized Losses	(1)	(7)
Fair Value	$ 7,984	$ 7,483

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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