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Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities
Selected cash payments, receipts, and noncash activities are as follows (in thousands):
 
Years Ended December 31,
 
2018
 
2017
 
2016
Cash paid for interest
$
197

 
$
127

 
$
162

Income taxes paid
859

 
12,755

 
642

Purchases of equipment financed through accounts payable
1,168

 
1,343

 
831

Deferred financing costs
—

 
30

 
10

Additional paid-in capital related tax adjustments
—

 
—

 
(423
)
Stock issuance of 441,009 shares in connection with acquisition of Stability
—

 
—

 
3,347

Stock issuance of 17,539 and 43,344 shares in exchange for services performed in 2017 and 2016, respectively
—

 
166

 
346