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, 2020	Dec. 31, 2019	Jun. 30, 2019
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash	$ 3,747	$ 3,950
Short term investments Gross unrealized gains	17	10
Short term investments Gross unrealized losses		(2)
Short term investments	6,520	21,686
Cash and cash equivalents and Short term investments, Amortized cost	35,096	34,875
Cash and cash equivalents and Short term investments, Estimated fair value	35,113	34,883
Cash and cash equivalents	28,593	13,197	$ 13,641
Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross unrealized gains	5	2
Short term investments Gross unrealized losses		(1)
Cash equivalents and Short term investments, Estimated Fair Value	26,918	8,579
Cash equivalents and Short term investments, Amortized cost	26,913	8,578
Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross unrealized gains	12	8
Short term investments Gross unrealized losses		(1)
Short term investments	4,448	18,607
Cash equivalents and Short term investments, Estimated Fair Value	4,448	22,354
Cash and cash equivalents		3,747
Cash equivalents and Short term investments, Amortized cost	4,436	22,347
Money Market Funds \| Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	24,846	5,500
Repurchase Agreements \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents		3,000
US Treasury Securities \| Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized cost	2,067	3,078
Short term investments Gross unrealized gains	5	2
Short term investments Gross unrealized losses		(1)
Short term investments	2,072	3,079
Commercial Paper \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents		747
Short Term Investments Amortized cost		8,920
Short term investments		8,173
Cash equivalents and Short term investments, Estimated Fair Value		8,920
Corporate Debt Securities \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized cost	2,182	5,922
Short term investments Gross unrealized gains	7	5
Short term investments Gross unrealized losses		(1)
Short term investments	2,189	5,926
Asset-backed Securities \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized cost	2,254	4,505
Short term investments Gross unrealized gains	5	3
Short term investments	2,259	4,508
Cash equivalents and Short term investments, Estimated Fair Value	$ 2,259	$ 4,508

Cash and cash equivalents and short-term investments.

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Cash And Cash Equivalents At Carrying Value And Available For Sale Securities Debt Securities Current.

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Cash equivalents at carrying value and available for sale debt securities amortized cost basis.

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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).

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Amount, before tax, of unrealized loss 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).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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