Consolidated Balance Sheets - USD ($)	Sep. 30, 2017	Sep. 30, 2016
ASSETS
Cash and cash equivalents	$ 12,803,887	$ 13,466,711
Short-term marketable securities	4,359,542	2,936,124
Accounts receivable	5,681,882	3,408,912
Inventories, net	5,257,234	4,763,909
Prepaid expenses and other	983,322	595,638
Total current assets	29,085,867	25,171,294
Long-term marketable securities	711,124	2,187,536
Deferred tax assets	8,331,000	8,527,000
Property and equipment, net	509,603	473,344
Intangible assets, net	55,689	62,905
Prepaid expenses and other - noncurrent	164,517	391,454
Total assets	38,857,800	36,813,533
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	1,112,366	574,566
Accrued liabilities	2,561,395	1,503,044
Total current liabilities	3,673,761	2,077,610
Other liabilities, noncurrent		165,038
Total liabilities	3,673,761	2,242,648
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $0.00001 par value; 5,000,000 shares authorized; none issued and outstanding	0	0
Common stock, $0.00001 par value; 50,000,000 shares authorized; 32,158,436 and 31,800,103 shares issued and outstanding, respectively	322	318
Additional paid-in capital	87,956,839	86,467,215
Accumulated deficit	(52,771,853)	(51,895,099)
Accumulated other comprehensive loss	(1,269)	(1,549)
Total stockholders' equity	35,184,039	34,570,885
Total liabilities and stockholders' equity	$ 38,857,800	$ 36,813,533