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Fair value measurements (Tables)
9 Months Ended
Sep. 30, 2016
Fair Value Disclosures [Abstract]  
Assets measured at fair value on a recurring basis
The Company’s assets that are measured at fair value on a recurring basis within the fair value hierarchy are summarized as follows:
 
September 30, 2016
 
December 31, 2015
(in thousands)
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Cash equivalents (1):
 
 
 
 
 
 
 
 
 
 
 
Money market funds
$
4,954

 
$

 
$
4,954

 
$
51,059

 
$

 
$
51,059

Total cash equivalents
$
4,954

 
$

 
$
4,954

 
$
51,059

 
$

 
$
51,059

Marketable securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. agency securities
$

 
$
13,334

 
$
13,334

 
$

 
$
14,451

 
$
14,451

Commercial paper

 

 

 

 
2,197

 
2,197

Corporate debt securities

 
77,621

 
77,621

 

 
165,825

 
165,825

Municipal securities

 
2,360

 
2,360

 

 
11,913

 
11,913

Total marketable securities
$

 
$
93,315

 
$
93,315

 
$

 
$
194,386

 
$
194,386

(1) Included in “cash and cash equivalents” in the accompanying condensed consolidated balance sheets. Cash balances were $126.6 million and $228.6 million as of September 30, 2016 and December 31, 2015, respectively.
Available-for-sale Securities
The remaining contractual maturities of available-for-sale marketable securities are as follows:
(in thousands)
September 30,
2016
 
December 31,
2015
Less than one year
$
93,315

 
$
122,199

Greater than one year but less than two years

 
72,187

Total
$
93,315

 
$
194,386