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Cash and Cash Equivalents and Investments | 12 Months Ended
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Dec. 31, 2018
Cash and Cash Equivalents and Investments [Abstract] |
Cash and Cash Equivalents and Investments | NOTE 4. CASH AND CASH EQUIVALENTS AND INVESTMENTS The following table summarizes our cash, cash equivalents and investments as of December 31, 2018 and December 31, 2017 (in thousands): ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2018
﻿ |  |  | Gross |  | Gross |  |
﻿ | Amortized |  | unrealized |  | unrealized |  | Fair
﻿ | Cost |  | gains |  | losses |  | Value
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 18,844 |  | $ | — |  | $ | — |  | $ | 18,844
﻿Total cash and cash equivalents |  | 18,844 |  |  | — |  |  | — |  |  | 18,844
﻿Investments: |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | 53,493 |  |  | — |  |  | (24) |  |  | 53,469
﻿Corporate debt securities |  | 10,223 |  |  | 3 |  |  | (12) |  |  | 10,214
﻿Asset backed securities |  | — |  |  | — |  |  | — |  |  | —
﻿US government & agency securities |  | 19,830 |  |  | — |  |  | (3) |  |  | 19,827
﻿Total investments |  | 83,546 |  |  | 3 |  |  | (39) |  |  | 83,510
﻿Total cash, cash equivalents and investments | $ | 102,390 |  | $ | 3 |  | $ | (39) |  | $ | 102,354
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿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
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ The following table summarizes the contractual maturities of our cash equivalents and available-for-sale investments, excluding money market funds, as of December 31, 2018: ﻿
﻿ |  |
﻿ |  |
﻿(in thousands) | Fair Value
﻿Due in one year or less | $ | 82,023
﻿Due after one year through five years |  | 1,487
﻿Total | $ | 83,510
﻿ |  |
﻿ Substantially all of our marketable debt investments are classified as current based on the nature of the investments and their availability for use in current operations. ﻿ Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.

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- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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