Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 27,273	$ 55,673
Short-term investments	18,675	6,162
Accounts receivable	1,593	712
Inventory	346	336
Prepaid expenses and other current assets	1,306	1,432
Total current assets	49,193	64,315
Property and equipment, net	15,662	13,736
Operating lease right-of-use assets	5,028
Intangible assets, net	778	924
Goodwill	278	278
Other assets	353	913
TOTAL ASSETS	71,292	80,166
Current liabilities:
Accounts payable and accrued expenses	10,233	6,508
Other current liabilities	2,582	316
Current portion of long-term note payable	538	529
Deferred revenue	134	170
Total current liabilities	13,487	7,523
Long-term note payable, net	247	479
Operating lease liabilities	3,358
Other long-term liabilities	1,808	131
Total liabilities	18,900	8,133
Commitments and Contingencies
STOCKHOLDERS' EQUITY:
Preferred stock - 25,000,000 shares authorized, 0 shares issued and outstanding at September 30, 2019 and December 31, 2018
Common stock - $.001 par value; 250,000,000 shares authorized; 26,932,764 and 21,447,088 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	27	21
Additional paid-in capital	466,514	414,840
Accumulated other comprehensive income	63	36
Accumulated deficit	(414,212)	(342,864)
Total stockholders' equity	52,392	72,033
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 71,292	$ 80,166