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Investment Securities and Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of Available-for-sale Securities
Investment securities classified as available-for-sale consisted of the following at September 30, 2017 and December 31, 2016 (in thousands):
 
September 30, 2017
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Corporate bonds
$
34,558

 
$
11

 
$
(19
)
 
$
34,550

Agency securities
11,302

 
—

 
(17
)
 
11,285

Certificates of deposit
2,982

 
3

 
(1
)
 
2,984

Total available-for-sale investment securities
$
48,842

 
$
14

 
$
(37
)
 
$
48,819

 
December 31, 2016
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Corporate bonds
$
30,492

 
$
9

 
$
(56
)
 
$
30,445

Agency securities
6,248

 
—

 
(20
)
 
6,228

Certificates of deposit
5,472

 
16

 
—

 
5,488

Total available-for-sale investment securities
$
42,212

 
$
25

 
$
(76
)
 
$
42,161
Available-for-sale Investments, by Remaining Contract Maturity
At September 30, 2017 and December 31, 2016, the contractual maturities of our investments did not exceed 36 months. The fair values of available-for-sale investments, by remaining contractual maturity, are as follows (in thousands):
 
September 30, 2017
 
December 31, 2016
 
Amortized Cost
 
Estimated Fair Value
 
Amortized Cost
 
Estimated Fair Value
Due in 1 year or less
$
28,398

 
$
28,396

 
$
15,475

 
$
15,473

Due after 1 year through 3 years
20,444

 
20,423

 
26,737

 
26,688

Total available-for-sale investment securities
$
48,842

 
$
48,819

 
$
42,212

 
$
42,161
Schedule of Sales, Calls, and Maturities
During the nine months ended September 30, 2017 and 2016, we had sales and maturities (which includes calls) of investment securities, as follows (in thousands):
 
Nine Months Ended September 30, 2017
 
Gross Realized Gains
 
Gross Realized Losses
 
Gross Proceeds from Sales
 
Gross Proceeds from Maturities
Agency securities
$
1

 
$
—

 
$
15

 
$
1,044

Corporate bonds
—

 
—

 
—

 
7,440

Certificates of deposit
—

 
—

 
—

 
2,490

 
$
1

 
$
—

 
$
15

 
$
10,974

 
Nine Months Ended September 30, 2016
 
Gross Realized Gains
 
Gross Realized Losses
 
Gross Proceeds from Sales
 
Gross Proceeds from Maturities
Agency securities
$
5

 
$
—

 
$
3,005

 
$
9,557

Corporate bonds
1

 
—

 
5,011

 
2,480

Treasury bills
—

 
—

 
2,000

 
3,830

Certificates of Deposit
—

 
—

 
—

 
1,245

 
$
6

 
$
—

 
$
10,016

 
$
17,112
Fair Value, Assets Measured on Recurring Basis
The following tables summarize our financial assets measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016, by level within the fair value hierarchy (in thousands):
 
September 30, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total Fair
Value
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
3,910

 
$
—

 
$
—

 
$
3,910

Available-for-sale investment securities:
 
 
 
 
 
 
 
Corporate bonds
—

 
34,550

 
—

 
34,550

Agency securities
—

 
11,285

 
—

 
11,285

Certificates of deposit
2,984

 
—

 
—

 
2,984

Total
$
6,894

 
$
45,835

 
$
—

 
$
52,729

 
December 31, 2016
 
Level 1
 
Level 2
 
Level 3
 
Total Fair
Value
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
4,849

 
$
—

 
$
—

 
$
4,849

Available-for-sale investment securities:
 
 
 
 
 
 
 
Corporate bonds
—

 
30,445

 
—

 
30,445

Agency securities
—

 
6,228

 
—

 
6,228

Certificates of deposit
5,488

 
—

 
—

 
5,488

Total
$
10,337

 
$
36,673

 
$
—

 
$
47,010