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Fair Value Measurements - Fair Value Hierarchy (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Inputs, Level 3 |  |
Assets |  |
Total assets | $ 0 | $ 0
Liabilities |  |
Total liabilities | 0 | 0
Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 115,284,000 | 112,823,000
Liabilities |  |
Cash-settled stock options | 6,685,000 |
Total liabilities | 6,685,000 | 0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets |  |
Total assets | 2,530,000 | 1,156,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 112,754,000 | 111,667,000
Liabilities |  |
Cash-settled stock options | 6,685,000 |
Total liabilities | 6,685,000 |
Money market funds | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 2,530,000 | 1,156,000
Money market funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets |  |
Total assets | 2,530,000 | 1,156,000
U.S. Government agency bonds | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets |  | 1,982,000
U.S. Government agency bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets |  | 1,982,000
U.S. Government bonds | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets |  | 1,297,000
U.S. Government bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets |  | 1,297,000
Bank certificates of deposit | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents | 1,201,000 |
Total assets | 14,208,000 | 15,201,000
Bank certificates of deposit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 14,208,000 | 15,201,000
Commercial paper. | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 7,484,000 | 9,593,000
Commercial paper. | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 7,484,000 | 9,593,000
Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents |  | 1,000,000
Total assets | 65,638,000 | 61,752,000
Corporate notes | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 65,638,000 | 61,752,000
Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 25,424,000 | 21,842,000
Asset-backed securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | $ 25,424,000 | $ 21,842,000

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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