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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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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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