Condensed Balance Sheets - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 13,398,036	$ 7,507,659
Short-term investments available-for-sale, at fair value		4,304,901
Accounts receivable	1,550,868	1,377,441
Inventory, net of allowance of $207,880 at June 30, 2017 and $270,307 at December 31, 2016	1,313,507	1,511,053
Prepaid expenses and other	468,431	433,328
Total current assets	16,730,842	15,134,382
Deferred offering costs		49,630
Property and equipment, net	2,880,487	3,270,197
Total assets	19,611,329	18,454,209
Current liabilities:
Accounts payable	1,343,912	761,663
Accrued liabilities	1,213,611	1,670,286
Deferred revenue - current	637,929	335,659
NuvoGen obligation - current	509,618	604,751
Term loan payable - current	6,668,789	6,389,782
Other current liabilities	224,875	258,850
Total current liabilities	10,598,734	10,020,991
Term loan payable - non-current, net of discount and debt issuance costs	2,214,820	5,389,137
NuvoGen obligation - non-current, net of discount	7,811,866	8,017,356
Other non-current liabilities	533,806	619,587
Total liabilities	21,159,226	24,047,071
Commitments and Contingencies
Stockholders’ deficit:
Common stock, $0.001 par value; 200,000,000 shares authorized at June 30, 2017 and December 31, 2016; 11,358,324 shares issued and outstanding, at June 30, 2017; 7,939,967 and 7,938,571 shares issued and outstanding, respectively, at December 31, 2016	11,357	7,938
Additional paid-in-capital	125,703,966	110,081,334
Treasury stock, no shares as of June 30, 2017 and 1,396 shares as of December 31, 2016		(75,000)
Accumulated other comprehensive loss		(1,090)
Accumulated deficit	(127,263,220)	(115,606,044)
Total stockholders’ deficit	(1,547,897)	(5,592,862)
Total liabilities and stockholders' deficit	$ 19,611,329	$ 18,454,209

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.