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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Summary of Significant Accounting Policies [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis



	December 31, 2019												December 31, 2018
(in thousands)	Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3			Total
Assets
Cash and cash equivalents:
Cash and money market funds	$	18,644		$	—		$	—		$	18,644		$	18,844		$	—		$	—		$	18,844
Commercial paper		—			10,983			—			10,983			—			—			—			—
Total cash and cash equivalents		18,644			10,983			—			29,627			18,844			—			—			18,844
Investments:
Commercial paper		—			16,971			—			16,971			—			53,469			—			53,469
Corporate debt securities		—			2,501			—			2,501			—			10,214			—			10,214
US government & agency securities		—			—			—			—			—			19,827			—			19,827
Total investments		—			19,472			—			19,472			—			83,510			—			83,510
Long-term restricted cash:
Cash		4,000			—			—			4,000			4,500			—			—			4,500
Total assets measured at fair value	$	22,644		$	30,455		$	—		$	53,099		$	23,344		$	83,510		$	—		$	106,854

Liabilities
Financing derivative	$	—		$	—		$	—		$	—		$	—		$	—		$	16		$	16
Continuation Advances		—			—			—			—			—			—			—			—
Total liabilities measured at fair value	$	—		$	—		$	—		$	—		$	—		$	—		$	16		$	16




Changes in Fair Value of Financing Derivative



Financing Derivative		Amount
Balance as of December 31, 2017		$	183
Gain on change in fair value of Financing Derivative			(167)
Balance as of December 31, 2018			16
Gain on change in fair value of Financing Derivative			(16)
Balance as of December 31, 2019		$	—




Estimated Fair Value and Carrying Value of Notes



	December 31, 2019						December 31, 2018
	Fair Value			Carrying Value			Fair Value			Carrying Value
Long-term notes payable	$	16,038		$	15,871		$	15,915		$	14,659



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Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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