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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 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash | $ 2,564 | $ 3,044 |  |
Short term investments Gross Unrealized Gains | 13 |  |  |
Short term investments Gross Unrealized Losses |  | (9) |  |
Short term investments | 20,572 | 20,169 |  |
Cash and cash equivalents and Short term investments, Amortized Cost | 34,200 | 33,799 |  |
Cash and cash equivalents and Short term investments, Estimated Fair Value | 34,213 | 33,790 |  |
Cash and cash equivalents | 13,641 | 13,621 | $ 13,259 | $ 15,026
Level 1 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short term investments Gross Unrealized Gains | 6 |  |  |
Cash equivalents and Short term investments, Estimated Fair Value | 11,524 | 7,470 |  |
Cash equivalents and Short term investments, Amortized Cost | 11,518 | 7,470 |  |
Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short term investments Gross Unrealized Gains | 7 |  |  |
Short term investments Gross Unrealized Losses |  | (9) |  |
Short term investments | 15,576 | 18,181 |  |
Cash equivalents and Short term investments, Estimated Fair Value | 20,125 | 23,276 |  |
Cash and cash equivalents | 4,549 | 5,095 |  |
Cash equivalents and Short term investments, Amortized Cost | 20,118 | 23,285 |  |
Money Market Funds | Level 1 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 6,528 | 5,482 |  |
Repurchase Agreements | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 3,001 | 3,000 |  |
US Treasury Securities | Level 1 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short Term Investments Amortized Cost | 4,990 | 1,988 |  |
Short term investments Gross Unrealized Gains | 6 |  |  |
Short term investments | 4,996 | 1,988 |  |
Commercial Paper | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 1,548 | 2,095 |  |
Short Term Investments Amortized Cost | 9,678 | 10,639 |  |
Short term investments | 8,130 | 8,544 |  |
Cash equivalents and Short term investments, Estimated Fair Value | 9,678 | 10,639 |  |
Corporate Debt Securities | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short Term Investments Amortized Cost | 3,038 | 5,964 |  |
Short term investments Gross Unrealized Gains | 4 |  |  |
Short term investments Gross Unrealized Losses |  | (7) |  |
Short term investments | 3,042 | 5,957 |  |
Asset-backed Securities | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short Term Investments Amortized Cost | 4,401 | 3,682 |  |
Short term investments Gross Unrealized Gains | 3 |  |  |
Short term investments Gross Unrealized Losses |  | (2) |  |
Short term investments | 4,404 | 3,680 |  |
Cash equivalents and Short term investments, Estimated Fair Value | $ 4,404 | $ 3,680 |  |

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