Financial Instruments

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Cash Equivalents

The Company had $644 and $0 of held-to-maturity securities with original maturities of three months or less, primarily consisting of corporate debt securities, classified as cash equivalents at December 31, 2017 and 2016, respectively. The Company's investments in held-to-maturity securities were held at amortized cost, which approximates fair value.

Restricted Cash and Cash Equivalents

The Company had restricted cash and cash equivalents of $23 at December 31, 2017, which was primarily related to balances that are restricted for payment of distributions to certain of the Company's current and former employees. The Company had restricted cash and cash equivalents of $186 at December 31, 2016, which was primarily related to the balances deposited with and held as security by the lender under the Company's prior term loan facility and for distributions to certain of the Company's current and former employees. The current portion of restricted cash and cash equivalents was $1 and $161 at December 31, 2017 and 2016, respectively. The non-current portion of restricted cash and cash equivalents was $22 and $25 at December 31, 2017 and 2016, respectively, and is reflected under other assets, net in the consolidated balance sheets.

Available-for-Sale Marketable Securities

The Company had no available-for-sale securities at December 31, 2017 and 2016. The proceeds from sales and maturities of available-for-sale securities included in the consolidated statements of cash flows and the gross realized gains included in the consolidated statements of operations are reflected in the table below. No gross realized losses were realized during these periods. The cost of securities sold was determined using the specific identification method.



	Year Ended December 31,
	2017		2016		2015
Proceeds from sales and maturities of securities	$	—	$	663	$	49
Gross realized gains	—		54		4