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Investment Securities and Fair Value Measurements - Investment Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 48,842	$ 42,212
Gross Unrealized Gains	14	25
Gross Unrealized Losses	(37)	(76)
Estimated Fair Value	$ 48,819	$ 42,161
Maximum contractual maturity period	36 months	36 months
Amortized Cost
Due in 1 year or less	$ 28,398	$ 15,475
Due after 1 year through 3 years	20,444	26,737
Total available-for-sale investment securities	48,842	42,212
Estimated Fair Value
Due in 1 year or less	28,396	15,473
Due after 1 year through 3 years	20,423	26,688
Total available-for-sale investment securities	48,819	42,161
Corporate bonds
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	34,558	30,492
Gross Unrealized Gains	11	9
Gross Unrealized Losses	(19)	(56)
Estimated Fair Value	34,550	30,445
Agency securities
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	11,302	6,248
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(17)	(20)
Estimated Fair Value	11,285	6,228
Certificates of deposit
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	2,982	5,472
Gross Unrealized Gains	3	16
Gross Unrealized Losses	(1)	0
Estimated Fair Value	$ 2,984	$ 5,488

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