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Cash, Cash Equivalents and Short-Term Investments - Schedule of Cash and Cash Equivalents and Short-term Investments by Significant Investment Category (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Cash | $ 3,950 | $ 3,044
Short term investments Gross Unrealized Gains | 10 |
Short term investments Gross Unrealized Losses | (2) | (10)
Short term investments | 21,686 | 20,169
Cash and cash equivalents and Short term investments, Amortized Cost | 34,875 | 33,799
Cash and cash equivalents and Short term investments, Estimated Fair Value | 34,883 | 33,790
Cash and cash equivalents | 13,197 | 13,621
Level 1 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short term investments Gross Unrealized Gains | 2 |
Short term investments Gross Unrealized Losses | (1) |
Cash equivalents and Short term investments, Estimated Fair Value | 8,579 | 7,470
Cash equivalents and Short term investments, Amortized Cost | 8,578 | 7,470
Level 2 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short term investments Gross Unrealized Gains | 8 |
Short term investments Gross Unrealized Losses | (1) | (10)
Short term investments | 18,607 | 18,181
Cash equivalents and Short term investments, Estimated Fair Value | 22,354 | 23,276
Cash and cash equivalents | 3,747 | 5,095
Cash equivalents and Short term investments, Amortized Cost | 22,347 | 23,285
Money Market Funds | Level 1 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Cash equivalents | 5,500 | 5,482
Repurchase Agreements | Level 2 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Cash equivalents | 3,000 | 3,000
US Treasury Securities | Level 1 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short Term Investments Amortized Cost | 3,078 | 1,988
Short term investments Gross Unrealized Gains | 2 |
Short term investments Gross Unrealized Losses | (1) |
Short term investments | 3,079 | 1,988
Commercial Paper | Level 2 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Cash equivalents | 747 | 2,095
Short Term Investments Amortized Cost | 8,920 | 10,639
Short term investments | 8,173 | 8,544
Cash equivalents and Short term investments, Estimated Fair Value | 8,920 | 10,639
Corporate Debt Securities | Level 2 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short Term Investments Amortized Cost | 5,922 | 5,964
Short term investments Gross Unrealized Gains | 5 |
Short term investments Gross Unrealized Losses | (1) | (7)
Short term investments | 5,926 | 5,957
Asset-backed Securities | Level 2 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short Term Investments Amortized Cost | 4,505 | 3,682
Short term investments Gross Unrealized Gains | 3 |
Short term investments Gross Unrealized Losses |  | (3)
Short term investments | 4,508 | 3,680
Cash equivalents and Short term investments, Estimated Fair Value | $ 4,508 | $ 3,680

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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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