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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 | Sep. 30, 2019 | Dec. 31, 2018
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Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Cash | $ 2,968 | $ 3,044
Short term investments Gross Unrealized Gains | 13 |
Short term investments Gross Unrealized Losses |  | (9)
Short term investments | 21,001 | 20,169
Cash and cash equivalents and Short term investments, Amortized Cost | 33,859 | 33,799
Cash and cash equivalents and Short term investments, Estimated Fair Value | 33,872 | 33,790
Cash and cash equivalents | 12,871 | 13,621
Level 1 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short term investments Gross Unrealized Gains | 4 |
Cash equivalents and Short term investments, Estimated Fair Value | 10,762 | 7,470
Cash equivalents and Short term investments, Amortized Cost | 10,758 | 7,470
Level 2 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short term investments Gross Unrealized Gains | 9 |
Short term investments Gross Unrealized Losses |  | (9)
Short term investments | 17,142 | 18,181
Cash equivalents and Short term investments, Estimated Fair Value | 20,142 | 23,276
Cash and cash equivalents | 3,000 | 5,095
Cash equivalents and Short term investments, Amortized Cost | 20,133 | 23,285
Money Market Funds | Level 1 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Cash equivalents | 6,903 | 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 | 3,855 | 1,988
Short term investments Gross Unrealized Gains | 4 |
Short term investments | 3,859 | 1,988
Commercial Paper | Level 2 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Cash equivalents |  | 2,095
Short Term Investments Amortized Cost | 9,641 | 10,639
Short term investments | 9,641 | 8,544
Cash equivalents and Short term investments, Estimated Fair Value | 9,641 | 10,639
Corporate Debt Securities | Level 2 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short Term Investments Amortized Cost | 3,740 | 5,964
Short term investments Gross Unrealized Gains | 6 |
Short term investments Gross Unrealized Losses |  | (7)
Short term investments | 3,746 | 5,957
Asset-backed Securities | Level 2 |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short Term Investments Amortized Cost | 3,752 | 3,682
Short term investments Gross Unrealized Gains | 3 |
Short term investments Gross Unrealized Losses |  | (2)
Short term investments | 3,755 | 3,680
Cash equivalents and Short term investments, Estimated Fair Value | $ 3,755 | $ 3,680

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