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Cash, Cash Equivalents and Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Cash, Cash Equivalents and Investments [Abstract] |
Summary of Cash, Cash Equivalents and Investments |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | As of June 30, 2018
﻿ |  |  | Gross |  | Gross |  |
﻿ | Amortized |  | unrealized |  | unrealized |  | Fair
﻿ | Cost |  | gains |  | losses |  | Value
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 16,438 |  | $ | — |  | $ | — |  | $ | 16,438
﻿Commercial paper |  | 6,621 |  |  | — |  |  | (1) |  |  | 6,620
﻿Total cash and cash equivalents |  | 23,059 |  |  | — |  |  | (1) |  |  | 23,058
﻿Investments: |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | 22,065 |  |  | — |  |  | (3) |  |  | 22,062
﻿Corporate debt securities |  | 4,375 |  |  | — |  |  | (6) |  |  | 4,369
﻿US government & agency securities |  | 14,008 |  |  | — |  |  | (6) |  |  | 14,002
﻿Total investments |  | 40,448 |  |  | — |  |  | (15) |  |  | 40,433
﻿Total cash, cash equivalents and investments | $ | 63,507 |  | $ | — |  | $ | (16) |  | $ | 63,491
﻿Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
﻿Cash | $ | 4,500 |  | $ | — |  | $ | — |  | $ | 4,500
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2017
﻿ |  |  | Gross |  | Gross |  |
﻿ | Amortized |  | unrealized |  | unrealized |  | Fair
﻿ | Cost |  | gains |  | losses |  | Value
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 14,858 |  | $ | — |  | $ | — |  | $ | 14,858
﻿Commercial paper |  | 1,649 |  |  | — |  |  | — |  |  | 1,649
﻿Total cash and cash equivalents |  | 16,507 |  |  | — |  |  | — |  |  | 16,507
﻿Investments: |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | 20,408 |  |  | — |  |  | (14) |  |  | 20,394
﻿Corporate debt securities |  | 9,043 |  |  | — |  |  | (9) |  |  | 9,034
﻿US government & agency securities |  | 16,946 |  |  | — |  |  | (9) |  |  | 16,937
﻿Total investments |  | 46,397 |  |  | — |  |  | (32) |  |  | 46,365
﻿Total cash, cash equivalents and investments | $ | 62,904 |  | $ | — |  | $ | (32) |  | $ | 62,872
﻿Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
﻿Cash | $ | 4,500 |  | $ | — |  | $ | — |  | $ | 4,500
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿
Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments |
﻿ |  |
﻿ |  |
﻿(in thousands) | Fair Value
﻿Due in one year or less | $ | 47,053
﻿

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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