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Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Investments All Other Investments [Abstract]  
Cash Equivalents, Restricted Cash and Short-Term Investments Classified as Available-for-sale Securities

Cash equivalents, restricted cash and short-term investments which are classified as available-for-sale securities, consisted of the following (in thousands):

 

December 31, 2017

 

Amortized

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

Losses

 

 

Estimated

Fair

Value

 

Money market funds

 

$

14,334

 

 

$

 

 

$

 

 

$

14,334

 

U.S. government agency securities

 

 

16,474

 

 

 

 

 

 

(3

)

 

 

16,471

 

Restricted cash (money market funds)

 

 

5,330

 

 

 

3

 

 

 

 

 

 

5,333

 

Agency securities

 

 

1,500

 

 

 

 

 

 

 

 

 

1,500

 

Total financial assets

 

$

37,638

 

 

$

3

 

 

$

(3

)

 

$

37,638

 

Classified as:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash and cash equivalents

 

 

 

 

 

 

 

 

 

 

 

 

 

$

14,334

 

Short-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17,971

 

Restricted cash (money market funds)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5,333

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

$

37,638

 

 

December 31, 2016

 

Amortized

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

Losses

 

 

Estimated

Fair

Value

 

Money market funds

 

$

10,156

 

 

$

 

 

$

 

 

$

10,156

 

U.S. government agency securities

 

 

6,802

 

 

 

 

 

 

(2

)

 

 

6,800

 

Restricted cash (money market funds)

 

 

19,593

 

 

 

 

 

 

 

 

 

19,593

 

Total financial assets

 

$

36,551

 

 

$

 

 

$

(2

)

 

$

36,549

 

Classified as:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash and cash equivalents

 

 

 

 

 

 

 

 

 

 

 

 

 

$

10,156

 

Restricted cash (money market funds)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

19,593

 

Short-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6,800

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

$

36,549